Clearer for pulp-screens



(No Model.)

F. A. OLOUDMAN.

GLEARER FOR PULP SCREENS.

Patented Feb. 1,1887.

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FRANCIS A. OLOUDMAN, OF CUMBERLAND MlLLS, MAINE, ASSIGNOR TO S. D. WVABREN 86 CO., OF BOSTON, MASSACHUSETTS.

CLEARER FOR PULP-SCREENS.

EPECIEICATION forming part of Letters Patent No. 356,926, dated February 1, 1887.

Application filoll October 19, 1886.

Serial No. 216,647. (No Midi I.)

To all whom it may concern:

Be it known that I, FRANCIS A. CLOUDMAN, of Cumberland Mills, county of Cumberland, and State of Maine, have invented an Illl provcinent in Glearers for Pulp-Scrcens, of which the following description, in connection with the accompanying drawings, is a spool-- fication, like letters on the drawings repre senting like parts.

This invention in paper-pill p screens has for its object to effectually keep open or clear thcslits in the screen-plate. To do this I have provided a rocking plate or cleaner which is located below the screen-plate, and is adapted to draw the liner pulp through the said screen on the downward movement of one half of the said plate, and to open or free the interstices of the said screen on the upward movement of the other half of the said plate, one half of the said plate being thus subjected to suction, while the other half is subjected to pressure.

My invention therefore consists, essentially, in a pulp-treating machine, of a pulpyat and a fixed or stationary screen-plate therein, combined with a rocking plate located below the screen-plate, and means, substantially as will be described, to impart a rocking motion to the said rocking plate, as and for the purpose hereinafter specified.

Other features of inyinvention will be pointed out in the claims at the end of the specification.

Figure 1 is an isometric view of a pulpscreeuing apparatus provided with my improved rocking plate or cleaner; Fig. 2, a side elevation of Fig. 1; Fig. 3, atransverse sec tion through the pulp-vat, showing a modified form of rocking plate or cleaner; and Fig. 4, a detail showing a part of the screen-plate.

The pulp vat or box A, supported 11 pon legs A, or in other suitable manner, contains within it a screen-plate, a, of usual construction, secured to a frame, a, fastened to the vat or box A, the said SClBQILPlZttG being supported near its center by a longitudinal rail, o (See dotted lines, Fig. 2.} Below the screen-plate a, and in close proximity to the rail (i is ashaft, cf, having its hearings in glands a", supported in the sides of the vat or box A, only one gland being shown in Fig. 1.

toward their ends, where they are united in any suitable manner.

The lower plate, I), for the best results, has secured to or forming partof it a semicircular plate, I). V

The shaft a and the plate Z), attached thereto,

have a rocking motion imparted to them by a sweep, b, slotted at its lower end to receive a crank-pin, c, fastened to a yoke, c, pivotally connected ata" (see Fig. 2) to a fly-wheel, 0

the other end of the yoke 0' being adjustably 6 secured bya bolt, c, inserted in holes 0 in the said fly-wheel, the adjustment of the bolt 0 enabling the stroke of the sweep, and thereby of the rocking plate, to be regulated as de sired, rotation being imparted to the fly-wheel 7o by a main shaft, (1, to which it is secured. As the plate I) is rocked through the mechanism described, one half, as 2, of said plate exerts a suction upon the pulp in the vatabove the screen-plate, while the other half, as 3, forces 7 5 some of the line stuff lying upon it back again and throu gh the interstices of the screen-plate.

The force with which the pulp is drawn through the screen-plate may be varied, ac-

cording as a coarser or finer stock is desired,

by means of dashboards c at opposite sides of the screen-plate, as shown in Fig. 2. Each dash-board e is adj ustably fastened to the vat or box A by screws c, extended through openings 12 in the dashboard, only one such opening being shown in Fig. l, the said screws beiug adjustable in slots c".

Pulp contained in the vat A will be drawn through the screen while one half, as 2, of the rocking plate is being moved downward, the

suction being continued until the end of the said plate clears the dash-board 6, when all suction of pulp through the screen by the said descending halfof the rocking plate isstopped.

As the said half of the rocking plateis moved 5 upward toward the screen-plate it forces some of the line pulp remaining upon its surface and lodged, it may be, on the screen up through the interstices of the screen-plate,

thus freeing them and agitating the pulp above the screen-plate, the other half of the rocking late being on its downward movement and drawing the pulp through the screen-plate at its side of the vat. The fine pulp passes from the vat A, through the opening in its side, to the paper-making machine.

The semicircular part 2) effects the least possible agitation of pulp below the screen-plate; but the said plate is not absolutely essential, as it may be omitted and the rocking plate, as shown in Fig. 3, be used with advantageous results.

I do not desire to limit my invention to the particular mechanism shown for imparting a rocking motion to the shaft (0 and its attached plate.

I do not claim a rising and falling screenplate.

I claim- 1. In a pulp-treating machine, a pulp-vat and a fixed or stationary screen-plate therein, combined with a rocking plate located below the screen-plate, and means, substantially as described, to impart a rocking motion to the saidrocking plate, for the purpose specified.

2. In a pulp-machine, a pulp-vat, a screenplate therein, and dash-boards secured to the vat at opposite sides of the said screen-plate,

combined with a rocking plate located below the screen-plate, and means, substantially as described, to impart a rocking motion to the said rocking plate, for the purpose specified.

3. In a pulp-machine, a pulp-vat, a screenplate therein, and adjustable dashboards secured to the vat at opposite sides of the said screen-plate, combined with a rocking plate located below the screen-plate, and means, substantially as described, to impart a rocking motion to the said rocking plate, for the purpose specified.

4. In apulp-machine, a pulp-vat and screenplate therein, combined with a rocking plate composed of an inclined upper plate and a semicircular lower plate, and located below the screen plate, and with means, substantially as described, to impart a rocking motion to the said rocking plate, substantially as and for the purpose set forth.

In testimony whereotI have signed my name to this specification in the presence of two subscribing. witnesses.

FRANCIS A. CLOUDMAN.

Witnesses:

' EDWIN WV. AYER,

FRANK H. CLOUDMAN. 

